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Haines DE. Spitzka and Spitzka on the brains of the assassins of presidents. „Journal of the history of the neurosciences”. 3–4 (4), s. 236–266, styczeń 2001. DOI: 10.1080/09647049509525641. PMID: 11619027.
G. Paulson. Death of a president and his assassin--errors in their diagnosis and autopsies. „J Hist Neurosci”. 15 (2), s. 77-91, Jun 2006. DOI: 10.1080/096470490953455. PMID: 16608737.